[PATCH] avr32: add varargs handling of prctl syscall

Hans-Christian Egtvedt hans-christian.egtvedt at atmel.com
Wed Jan 20 16:28:07 UTC 2010


prctl is defined to use varargs in the header file, hence it needs varargs
specific handling in the source. This patch properly handles the variodic
argument before the syscall is passed to the kernel for the AVR32 architecture.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt at atmel.com>
---
This is v2 of the previous attempt to add proper prctl handling for AVR32
architecture. If everybody are fine with this approach I'll commit it to
master, nptl and 0_9_30 branches.


 libc/sysdeps/linux/avr32/Makefile.arch |    2 +-
 libc/sysdeps/linux/avr32/prctl.c       |   36 ++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletions(-)
 create mode 100644 libc/sysdeps/linux/avr32/prctl.c

diff --git a/libc/sysdeps/linux/avr32/Makefile.arch b/libc/sysdeps/linux/avr32/Makefile.arch
index bc5f625..98b85a7 100644
--- a/libc/sysdeps/linux/avr32/Makefile.arch
+++ b/libc/sysdeps/linux/avr32/Makefile.arch
@@ -5,7 +5,7 @@
 # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 #
 
-CSRC	:= brk.c clone.c mmap.c sigaction.c
+CSRC	:= brk.c clone.c mmap.c prctl.c sigaction.c
 
 SSRC	:= __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S	\
 		sigrestorer.S syscall.S vfork.S
diff --git a/libc/sysdeps/linux/avr32/prctl.c b/libc/sysdeps/linux/avr32/prctl.c
new file mode 100644
index 0000000..4e146e3
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/prctl.c
@@ -0,0 +1,36 @@
+/*
+ * prctl syscall for AVR32 Linux.
+ *
+ * Copyright (C) 2010 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <sys/syscall.h>
+#include <sys/prctl.h>
+#include <stdarg.h>
+
+#ifdef __NR_prctl
+#define __NR___syscall_prctl	__NR_prctl
+static inline _syscall5(int, __syscall_prctl, int, option, long, arg2,
+		long, arg3, long, arg4, long, arg5);
+
+int prctl(int __option, ...)
+{
+	long arg2;
+	long arg3;
+	long arg4;
+	long arg5;
+	va_list ap;
+
+	va_start(ap, __option);
+	arg2 = va_arg(ap, long);
+	arg3 = va_arg(ap, long);
+	arg4 = va_arg(ap, long);
+	arg5 = va_arg(ap, long);
+	va_end(ap);
+
+	return INLINE_SYSCALL(prctl, 5, __option, arg2, arg3, arg4, arg5);
+}
+#endif
-- 
1.6.0.4



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